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Bidirectional meta-material absorber

A technology of absorbing body and metamaterial, applied in the field of microwave engineering technology absorbing materials, can solve the problems of reducing the absorbing rate of the absorbing body, limiting electromagnetic wave absorption, polarization insensitivity, etc.

Inactive Publication Date: 2015-11-18
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, researchers have proposed many kinds of metamaterial absorbers, such as various polarization-insensitive and multi-frequency metamaterial absorbers, but the work of these absorbers is limited to the absorption of electromagnetic waves in a certain direction, and Different characteristics such as polarization insensitivity and wide angle of incidence
In practical applications, if it is necessary to absorb electromagnetic waves in two opposite directions at the same time, simply placing two absorbers in a single direction back to each other will cause electromagnetic interference between each other, thereby reducing the original The absorption rate and other properties of the absorber

Method used

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Embodiment 1

[0024] Embodiment one: below and figure 1 — Figure 8 To illustrate this embodiment, the structure of the bidirectional metamaterial absorber described in this embodiment consists of five parts: the metal thin film 3 in the middle layer, the lossy dielectric layers 2 and 4 on both sides, and the metal etched on the lossy dielectric layer Square ring 1,5. The metal thin film 3 in the middle layer is an all-metal structure without a hollow structure, and its length and width are the same as those of the lossy dielectric layers 2 and 4, and the structural properties of the two dielectric layers are the same. At the same time, the two outermost metal square rings have the same structure and size. The two metal square rings 1 and 5 are rotated by 45 degrees compared with the lossy dielectric layer, that is, the four corners of the metal square rings 1 and 5 are located on the horizontal line and the vertical line respectively, and the centers of the two metal square rings are in ...

Embodiment 2

[0025] Embodiment 2: This embodiment further limits the bidirectional metamaterial absorber described in Embodiment 1. In this embodiment, the metal film 3 in the middle layer and the metal square rings on both sides are all made of metal copper , etch on the upper and lower sides of the dielectric layers 2 and 4 by using an etching technique. The outer length of the metal square rings 1 and 5 is 4.9mm, and the inner length is 3.9mm.

Embodiment 3

[0026] Embodiment 3: This embodiment further defines the bidirectional metamaterial absorber described in Embodiment 1. In this embodiment, the dielectric layers 2 and 4 use FR4 dielectric with a dielectric constant of 4.4 and a loss of The tangent value of the angle is 0.02, and the size is 10.3mm*10.3mm*0.61mm.

[0027] Figure 4 It is the equivalent impedance of the present invention relative to free space. It can be seen from the figure that the equivalent resistance of the absorber at the absorption peak frequency point is 1, and the equivalent reactance is 0. The absorber is well realized with Impedance matching of free space.

[0028] Figure 5 — Figure 8 It is the absorption rate curve diagram of the two-way metamaterial absorber provided by the present invention according to Embodiments 1, 2, and 3. It can be seen from the figure that the two-way metamaterial absorber provided by the present invention is at a frequency of 10.18 GHz to the vertical The absorption ...

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Abstract

The invention belongs to the field of absorbing materials of a microwave engineering technology, and concretely relates to a bidirectional meta-material absorber that can absorb electromagnetic waves at a specified frequency range in hidden, electromagnetic shielding and detecting conditions. The bidirectional meta-material absorber is of a unit periodic structure. The unit structure includes a middle-layer metal film, loss dielectric layers on two sides, and metal square rings etched on the two loss dielectric layers. The bidirectional meta-material absorber is of a symmetrical structure from top to bottom relative to the metal film in the middle, and resonators are formed on the upper side and a lower side of the structure respectively, so effects of absorbing electromagnetic waves in two directions can be achieved. Moreover, the bidirectional meta-material absorber has a wide incidence angle, the wave absorbing rate of the absorber at a frequency point still keeps more than 92% when the incidence angle of the electromagnetic waves is increased to 50 degrees, and the frequency corresponding to an absorption peak does not shift along with increases of the incidence angle.

Description

technical field [0001] The invention belongs to the field of wave-absorbing materials for microwave engineering technology, and in particular relates to a bidirectional metamaterial wave-absorbing body capable of absorbing electromagnetic waves of specified frequency bands in stealth, electromagnetic shielding and detection. Background technique [0002] Absorbing material is a kind of functional material that can effectively absorb incident electromagnetic waves and significantly reduce the echo intensity of the target. It can greatly reduce the radar cross section of the target, thereby improving its stealth performance. Traditional absorbing materials have disadvantages such as thickness, weight, and poor stability, which greatly restrict their application. [0003] Metamaterials refer to some artificial composite structures or composite materials with extraordinary physical properties that natural materials do not have. Metamaterial absorber, also known as metamaterial ...

Claims

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Application Information

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IPC IPC(8): H01Q17/00
Inventor 周凯田春胜管有林
Owner HARBIN ENG UNIV
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